Talk:Libvirt

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KVM acceleration after removing qemu-kvm package

In order to have KVM acceleration after the removal of qemu-kvm I had to edit the config of my virtual machines like this:

<domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
...
  <qemu:commandline>
    <qemu:arg value='-machine'/>
    <qemu:arg value='accel=kvm'/>
    <qemu:arg value='kernel_irqchip=on' />
  </qemu:commandline>
</domain>

I don't know if there is some specific field in libvirt XML, but this works for me.

--Vimes656 (talk) 13:16, 7 March 2013 (UTC)Vimes656

Chip-level IRQs

Added chip level IRQs to the argument list of Vimes656 recommendation.

--En0 (talk) 15:49, 7 March 2013 (UTC)

kvm group

About the disput of using or not the kvm group, the discussion which lead to adding this group in the depreceated group list is there; deleted from the talk page of KVM article. Bricewge (talk) 16:26, 18 September 2014 (UTC)

Errors and possible fixes

If you get the following error(s) when creating a new virtual machine using virt-manager:

summary=Error launching details: 'Terminal' object has no attribute 'set_visible_bell'
details=Error launching details: 'Terminal' object has no attribute 'set_visible_bell'

install extra/vte290

sudo pacman -S vte290

and change the following line in /usr/share/virt-manager/virtManager/serialcon.py

BEFORE

from gi.repository import Vte

AFTER

#from gi.repository import Vte
import gi
gi.require_version('Vte', '2.90')
from gi.repository import Vte

to explicitely use a vte 290 terminal

Trouble shooting when configuring network

After following the instructions configuring a libvirt environment, if one provides the argument --network bridge=xxx to
virt-install, then an error may occur:

ERROR    internal error: /usr/lib/qemu/qemu-bridge-helper --br=xxx --fd=xx: \
failed to communicate with bridge helper: Transport endpoint is not connected

stderr=failed to parse default acl file `/etc/qemu/bridge.conf'

I would like to add a note section which describes the solution to this error, which is to create a file /etc/qemu/bridge.conf with proper settings.

If you are fine with this idea, I will add it soon. --NonerKao (talk) 06:28, 22 June 2016 (UTC)

Where is '/usr/share/libosinfo/db/oses/os.xml'?

At Libvirt#Create_a_new_domain_using_virt-install Tips. I have a kvm+qrmu+libvirt+virt-manager fresh install, but I can't find that file. I tried pacman -Ql libosinfo, and pkgfile, but didn't help. Is there something wrong? Or that file has been removed? Should to be removed?

Edit:I mean, even no '/usr/share/libosinfo/ directory.Kurobac (talk) 21:11, 9 July 2018 (UTC)

This seems to be a valid concern. Both pacman -Ql libosinfo and pacman -Fs libosinfo fail to yield any results for me.
Ichimonji10 (talk) 02:41, 21 October 2019 (UTC)

bridge-utils

The article says to install bridge-utils but according to https://wiki.linuxfoundation.org/networking/bridge (via https://www.kernel.org/doc/html/latest/networking/bridge.html)

"Note: the bridge-utils package is deprecated, instead use the bridge command from iproute2 package."

Beepboo (talk) 08:45, 12 March 2020 (UTC)

"Set up authentication." section. I feel like it should be re arranged.

The fastest and the simplest way is to add yourself to libvirt group.

However, right now the description of this method is buried somewhere in the middle. I feel like that should be at the top.

As of libvirt 1.2.16

That's 5 years ago. Is the version relevant?

Therefore there is no need to create a new group and rule file if your user is a member of the wheel group: upon connection to the RW socket (e.g. via virt-manager) you will be prompted for your user's password.

The wheel group did not work for me. Maybe it works if there is a GUI. (I used it over ssh)

ensure the libvirt group exists

It should be ensured while installing the package.

As an example, to authorize the kvm group, create the following file:

Would there be any conflicts because kvm is a real group used to give access to /dev/kvm. Maybe use some fictional group for the example.

Added the changes

Igo95862 (talk) 09:56, 5 April 2021 (UTC)